I'm having difficulty with Flex charts. I'm working on a complete rewrite of a flex app that has a fair bit of charting involved, and I've been instructed to get the look and feel as close to the previous version as possible (for the initial release).
I can't seem to find the style property which dispays a blue, tabbed sort of effect of the chart axes. As I don't have the rep to post an image, I'll direct you to the adobe live docs 'using line charts' page (sorry, I can only post one link because of the anti spamming mechanism, see link in the edit below) - the effect is present on the vertical axis of the chart at the top of the line charts examples page.
It seems to be some kind of default setting, but I have not been able to pin it down, not even when copying chunks of the old code.
If anyone has any ideas as to how to get hold of this style, or as to what could be removing this style, I'd be extremely grateful.
Thanks for reading.
Edit:
Sorry I will try to clarify:
If you look at the chart at the top of the using line charts page in the Adobe Live docs, the vertical axis has a thick, blue tabbed style, but the horizontal axis does not.
I am trying to gain control over this blue tabbed style - specifically I want to make it appear on the horizontal axis and remove it from the vertical axis of a line chart. However, I cannot find the property which sets this style.
I know it is possible to alter this style, as I have seen examples of charts with the look I need, however there does not appear to be an obvious way to alter it.
I hope this is a bit clearer. Thanks.
The blue bar that comes by default is a stroke. The white divisions within it are minor ticks.
To style it differently, you need four parts:
a chart (e.g. LineChart)
an Axis (e.g. LinearAxis)
an AxisRenderer
a Stroke (e.g. SolidColorStroke)
Then you'll have to connect these parts:
var chart = new LineChart();
var vAxis = new LinearAxis();
var stroke = new SolidColorStroke();
stroke.caps = CapsStyle.NONE;
stroke.weight = 1;
stroke.color = 0x000000;
var axisRenderer = new AxisRenderer();
axisRenderer.axis = vAxis;
axisRenderer.setStyle("axisStroke", stroke);
// Only if you don't want minor ticks to display:
axisRenderer.setStyle("minorTickPlacement", "none");
chart.verticalAxis = vAxis;
chart.verticalAxisRenderers = [axisRenderer];
You'll find more on the topic here: http://help.adobe.com/en_US/flex/using/WS2db454920e96a9e51e63e3d11c0bf69084-7c65.html
Its not enough clear for me, what do you want, but if you are looking for styling of charts look this, but if something about axis look this.
Anyway you should explain your goals, so we could help you.
Related
I have figured out how to create custom html tooltips by using roles via googleVis. I can easily modify the content using html but I cannot understand how I can control the tooltip box itself.
My problem was generated because some of the custom tooltips I created are falling outside my chart area and I tried (unsuccessfully) to find a way to control the tooltip position. Idealy I would like to make them behave in the exact same way default tooltips behave in googleVis (always stay withinin the chart area).
When I later implemented the same concept into a line chart I found that I have another problem as well. The tooltip is falling on the line so I cannot see what is the exact point that refers to the tooltip.
Would it be possible for example to keep the callout style of default googleVis tooltip and change the content with HTML?
Additionally, do you know if there is any way to control more tooltip properties like border and background color?
i was also looking for the same
1) when laying out your data, make sure it has columns alternating between, say, data and tooltips, data and tooltips,... that way it is possible to customize tooltips for multiple columns (it does not work if you just append - à la cbind - a set of tooltips columns to your data frame).
Additionally try this http://rcharts.io/viewer/?6644957#.VHcpEkvrdbg
Is there some way to position the legend using ZedGraph so that it is on the right-hand side, but vertically centred. Using:
output.Legend.Position = ZedGraph.LegendPos.Right
positions the legend at the top right, but beside a pie chart this looks misaligned. Is there a way to get the legend to vertically centre?
Changing output.Legend.Location.Y seems to have no effect, nor does trying output.Legend.Location.AlignV = ZedGraph.AlignV.Center
Added in response to first answer below...
Floating, reducing the chart size and positioning the label does centre vertically, and is better than I had managed previously. Unfortunately it has a side-effect, in that the legend switches to multi-column and tries to occupy half the width of the total chart area, thus usually overlapping the chart (see picture). Looking at the ZedGraph source, this wider mode is used for all layouts except Left and Right.
Location is only enabled when Legend.Position is set to Float.
You could do like this (C#):
output.Legend.Position = LegendPos.Float;
output.Legend.Location =
new Location(1.05f, 0.5f, CoordType.ChartFraction, AlignH.Right, AlignV.Center);
with the probably undesired "feature" that the legend is drawn partially inside the chart:
To workaround this issue I believe you also have to manually resize your chart:
output.Chart.Rect = new RectangleF(xstart, ystart, xsize, ysize);
Anders' answer nearly worked, except it had the side-effect of changing the width of the legend. This led me to download the source code to find out why, and I discovered that the legend positioning code is actually quite trivial. LegendPos.Right is only referenced twice in the code, both times in Legend.CalcRect
Adding a new LegendPos.MiddleRight only needs it added to the enum, a case for MiddleRight added to the first Switch which runs the same code as Right. And in the second Switch in CalcRect the following:
case LegendPos.MiddleRight:
newRect.X = clientRect.Right - totLegWidth;
newRect.Y = tChartRect.Top + tChartRect.Height / 2 - totLegHeight / 2;
tChartRect.Width -= totLegWidth + gapPix;
break;
This is the same code as for LegendPos.Right except for the newRect.Y line.
I've created a line chart in flex and it works like expected. Now, I would like to add shading to the background for specific information. For example, this chart - http://research.stlouisfed.org/fred2/graph/?id=TOTALSL,TOTALNS, - shows a shaded background for recessions. How would I mimic this shading in a Flex linechart?
Thanks
You could draw it in the background of the chart using the drawing api.
edit:
I dont know of any code examples on the web, I've only done it in production code (aka I cant share it, sorry :( )
you will want to create a container and put it into the charts
<mx:backgroundElements>
You should pass into this container the min and max for the x-axis probably as separate properties and a dataprovider that describes when to show a highlighted section. You might have to compute the min and max based on the dataprovider you pass into the chart.
If you just want to show the highlighted area you will just use the drawing api and compute where to put on the x-axis based on your min, max, width of container, and data point (start and end values) from your dataprovider. It will look something like this in your updateDisplayList:
// code is not tested but a good start
var shadeStartX:Number = (max-min)/startPoint;
var shadeEndX:Number = (max-min)/endPoint;
var shadeWidth:Number = shadeEndX - shadeStartX;
...
this.graphics.drawRect(shadeStartX, 0, shadeWidth, unscaledHeight);
but if you want to have things like hover states and all that goodness I would suggest creating a display object that you pass the width in and adding that to the container at the computed x-axis to set it at.
Hi I feel that drawing something yourself is not the right way to go.
You should ideally use a PlotSeries inside the LineChart, and create a custom item renderer for each element in the series.
PlotSeries allows you to give your own custom image/object to draw at a specific date/point in the chart.
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/mx/charts/series/PlotSeries.html
http://livedocs.adobe.com/flex/3/html/help.html?content=charts_types_10.html
All the examples show the plotSeries with smaller objects but you can create an object which covers the chart vertically and has a constant width.
I have an ASP.Net Chart Control of ChartType "Spline", one ChartArea and one Series (it's a sparkline). I was just wondering if anyone out there knew how I could color the area underneath the line - I can't seem to find the property that allows me to do this without coloring the entire background.
Thanks in advance
You need to have a chart with a ChartType of Area to achieve this type of look (similar to google analytics). I have tried it and it does work although i'm not sure how you might get the line to be one particular colour and the area underneath to be a second colour?
http://social.msdn.microsoft.com/Forums/en-US/MSWinWebChart/thread/981cc4df-2b23-4557-8d89-0b45d553fecc/
I have a line chart that sometimes contains a number of data points. I have solved how to prevent the horizontal axis from displaying too many labels using custom label functions and data functions. My problem is forcing the AxisRenderer not to scale down my labels.
I'm using the labelRotation property so the canDropLabels and canStagger properties are not an option.
Thanks in advance for any replies.
Try use gutter, gutter set are for the axis labels (if you want u can try to read the code of the AxisRenderer, and see how it use the gutter and other parameters to scale if need the text.
You can set the gutter by style like this (this work for me):
LineChart {
gutterLeft:50;
gutterRight:50;
gutterBottom:50;
}
I believe this can be done by editing the labelRenderer property. Take a look at the second example on this page (Formatting charts), they define a custom component to use as the label. You can do something like that to maintain whatever look you want.
I ran into the same issue. In my case (for the data that I'm plotting), simply setting canDropLabels to true (either in ActionScript or MXML as below) resulted in widening the margins allocated (I'm guessing) to the label text in the chart such that I never saw the text render smaller than set by fontSize below. Try it, it may be all you need.
hAxisRenderer.setStyle("canDropLabels",true);
...
<mx:AxisRenderer id="hAxisRenderer" placement="bottom"
tickPlacement="inside" tickLength="8"
canStagger="false" canDropLabels="false" fontSize="12">
For reference: http://blog.flexexamples.com/2007/10/16/dropping-labels-in-a-flex-chart/